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5SM3 Residual Current Circuit Breakers

5SM3 Residual Current Circuit Breakers are applied in AC circuit of 50Hz, rated voltage up to 415V, rated current up to 100A.

They are mainly used as indirect contact protection for human, and also can be used to prevent against fire danger caused by earth fault current owing to equipment installation damage. When the protective measures of the electric shock are out of work, the rccb which rated residual current less than 30mA can serve as the supplementary protection in direct contacts, but they can not be used as the sole direct contact protection.